Detect Umbra relayer/API version change and force reload

[jferas]

Resolves #309

Added most recently obtained version of Umbra relayer/API to local storage..

At startup, on creation of Umbra relayer/API.. and on every interaction between the front-end and the API.. the API version is returned in the API's response to the front-end, and the version and local storage are used in the following way:

1. Attempt to read the most recently saved API version from local storage.
2. If the version does not exist in local storage, save the most recently received version from the API to local storage.
3. If the version does exist in local storage, compare it to the version received from the API.. if the major/minor numbers differ, the following actions are taken:
   a. The saved API version in local storage is cleared.
   b. The user is alerted.
   c. The user is forced to reload the front-end web app.
   d. On that reload, because the saved version in local storage is not present, the save described in step 2 above will occur.

Currently the alert to the user is just that.. a javascript "alert".. but can probably be done in a more "Vue-centric" way.

[garyghayrat]

Just a nit, but otherwise working great. Thank you john!

[alexkeating]

A couple small nits then should be good to merge.

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[github-actions]

Coverage after merging frontend-reload-on-api-version-change into master will be

81.12%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
contracts-periphery/src
UmbraBatchSend.sol	100%	100%	100%	100%
UniswapWithdrawHook.sol	81.82%	100%	66.67%	83.33%	14
umbra-js/src
ethers.ts	76.27%	100%	61.11%	100%
types.ts	50%	100%	0%	100%
umbra-js/src/classes
KeyPair.ts	98.65%	96.49%	100%	100%	31–32
RandomNumber.ts	100%	100%	100%	100%
StealthKeyRegistry.ts	100%	100%	100%	100%
TxHistoryProvider.ts	77.55%	76.47%	66.67%	79.31%	11, 11, 19–20, 31, 38, 44, 53, 57, 8
Umbra.ts	75.41%	63.69%	82.93%	82.09%	105, 135–136, 157, 229–231, 315–318, 380, 394, 401–403, 405–406, 409–410, 428, 430, 432, 432, 432, 432–433, 433, 433–435, 450, 450, 450–451, 455, 458, 478, 496–498, 585, 602, 615–616, 626–627, 640, 643–644, 674–675, 751, 755, 755, 755–758, 758, 758, 758, 758, 758, 758–759, 759, 759, 759, 759, 759, 759, 759, 759, 759, 759, 761, 761, 761–762, 765, 765, 765, 765, 765–766, 769, 778, 778, 787, 790, 790, 790–792, 805, 809, 812–813, 819–821, 828, 828, 828–831, 862, 867–868, 868–869
umbra-js/src/typechain
index.ts	70.59%	100%	37.50%	100%
umbra-js/src/typechain/factories
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@OpenZeppelin
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/access
Ownable__factory.ts	50%	100%	0%	66.67%	70, 76
index.ts	50%	100%	0%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/token
index.ts	100%	100%	100%	100%
umbra-js/src/typechain/factories/@openzeppelin/contracts/token/ERC20
ERC20__factory.ts	29.03%	0%	12.50%	47.06%	310, 314, 314, 314–315, 317, 326, 326, 326, 333, 333, 333, 336, 339, 345
IERC20__factory.ts	50%	100%	0%	66.67%	201, 204
index.ts	50%	100%	0%	100%
umbra-js/src/typechain/factories/contracts
IUmbraHookReceiver__factory.ts	50%	100%	0%	66.67%	61, 67
MockHook__factory.ts	22.58%	0%	0%	41.18%	107, 111, 111, 111–112, 114, 121, 121, 121, 126, 126, 126, 129, 132, 138, 144
StealthKeyRegistry__factory.ts	22.58%	0%	0%	41.18%	202, 206, 206, 206–207, 209, 216, 216, 216, 221, 221, 221, 224, 227, 233, 239
TestToken__factory.ts	64.52%	66.67%	50%	70.59%	329–330, 348, 351, 354, 360, 366
Umbra__factory.ts	70.97%	66.67%	62.50%	76.47%	495–496, 525, 529, 532, 538
index.ts	50%	100%	0%	100%
umbra-js/src/utils
cns.ts	50%	33.33%	50%	55%	33–36, 40, 40, 40, 40, 40–41, 44–46
constants.ts	100%	100%	100%	100%
ens.ts	36.11%	25%	33.33%	40%	25–27, 35, 56–57, 57, 57–58, 63–64, 66, 70, 70, 70, 70, 70–71, 75–77
utils.ts	76.67%	68.66%	76.92%	82%	109–111, 113–115, 121, 139–140, 169, 190, 246, 253–260, 260, 260, 260, 260, 260, 260–261, 263, 294, 296–297, 306, 306, 306–307, 309, 312, 321–322, 363, 380, 380, 380, 400, 429, 431, 436, 448, 448–449, 454, 456–457, 468–472, 478, 480, 522–523, 523, 523–525, 525, 525, 536, 59–60, 779–780, 792–793, 85, 93, 93
umbra-js/test
testPrivateKeys.ts	100%	100%	100%	100%
utils.ts	100%	100%	100%	100%